Write current database with parametr

hi everyone :)

i have a table in my database and this table's columns are

TERM_2  nvarchar

COUNT   int

UNIT        nvarchar

my workflow reads data from another table and do some n gram algortms and create some results.

at the end of the results i have

ngram                            count*document frequecy

analys raport                      54

tecnical documents           45

.....

...

..

now my first question is i want to write this results to my table and ngram column to TERM_2 coloumn and  count*document frequecy to COUNT

how can i do that?  is there any node for that ? in database writer node i could not find a option for select columns or etc. only asking  a table name and i dont want to change my database table column names. 

second question is i want to define a parameter and i want to write UNIT column that value for example,

let set the value to parameter  'A'

TERM_2                          COUNT               UNIT

analys raport                      54                       A

tecnical documents           45                       A 

.....

...

..

Please help me :) i am trying to do that more than 2 days.